Make ctrl-c interrupt threading.Lock.acquire() on Windows

[colesbury]

Feature or enhancement

Since Python 3.2, pressing ctrl-c (SIGINT) interrupts threading.Lock.acquire() on POSIX platforms, including Linux and macOS. However, this does not work on Windows.

Now that threading.Lock and threading.RLock use PyMutex and _PyRecursiveMutex internally, this should be a lot easier to implement efficiently.

See also #125058

cc @pitrou @zooba @gpshead

Linked PRs

• gh-125541: Make Ctrl-C interrupt threading.Lock.acquire() on Windows #125546

[pitrou]

You mean here

cpython/Python/parking_lot.c

Line 114 in aac89b5

wait = WaitForSingleObjectEx(sema->platform_sem, millis, FALSE);

?

[colesbury]

Yes, we can use WaitForMultipleObjectsEx() with _PyOS_SigintEvent() there without performance implications because that is the slow path that's only taken if the thread is about to block.